K.C.S.E Physics Q & A - MODEL 2004PP2QN04
​a) Fig 5 shows the displacement time graph of a wave traveling at 200cm/
​Determine for the wave the
i) Amplitude ii) Period iii) Frequency iv) Wavelength b) i) In the space provided below, sketch a labeled diagram to show how pinhole camera forms an image of a vertical object placed in front of the pinhole. ii) a building standing 200m from a pinhole camera produces on the screen of the camera an image 2.5cm high 5.0cm behind the pinhole. Determine the actual height of the building
1 Comment
K.C.S.E Physics Q & A - MODEL 2004PP2QN03
​ Figure 4 shows the cross-section of a diffusion cloud chamber used to detect radiation from radioactive sources.
a) i) State one function of each of the following:
Alcohol solid Co2 ii) When radiation from the source enters the chamber, some white traces are observed. Explain how these traces are formed and state how the radiation is identified. iii) A leaf electroscope can also be used as a detector of radiation. State two advantages of the diffusion cloud chamber over the leaf electroscope as a detector. b) i) Two samples of the same radioactive material have initial masses M and 2M respectively. On the axes provided, sketch the graph of activity versus time for each sample. Label the graph for each sample. ii) A radioactive sample of half-life 130 days initially has 1.0 x 102c radioactive atoms. Determine the number of radioactive atoms that have decayed after 390 days.K.C.S.E Physics Q & A - MODEL 2004PP2QN02
​ a) In an experiment to determine the power of an electric heater, melting ice was place in a container with an outlet and the heater placed in the ice as shown in Fig. 2. The melted ice was collected.
​i) Other than the current and voltage, state the measurement that would be taken to determine the quantity of heat absorbed by the melted ice in unit time.
(ii) If the latent heat of fusion of ice is L, show how measurement in (i) above would be used in determining the power P. of the heater. (iii) It is found that the power determined in this experiment is lower than the manufacturer‟s value indicated on the heater. b) Fig 3 shows part of an experimental set up for estimating the diameter of an oil molecule.
i) Describe how the oil patch is formed
ii) In an experiment the diameter a, of the patch was measured to be 200mm for an oil drop of radius 0.25mm. Determine the diameter of the molecule of the oil. K.C.S.E Physics Q & A - MODEL 2004PP2QN01
​a) A test tube of uniform cross-section loaded so that it can float upright in water. With the aid of a labeled diagram, describe how the test tube may be calibrated to measure the density of liquid.
​b) In an experiment to determine the density of a liquid, a uniform metal cylinder of cross-section area 6.2cm was hang from a spring balance and lowered gradually into the liquid. The up thrust was determined for various submerged lengths. The results obtained are shown on the graph in Fig 1.
Using graph, determine;
(i) The value of the up thrust when the cylinder is fully submerged (ii) The Density of the liquid K.C.S.E Physics Q & A - MODEL 2004PP1QN35&36
​Figure 18 shows the circuit of a npn-n transistor amplifier in common –emitter mode. Use the information on the figure to answer question 35 and 36
On the diagram
a) Label the collector current, Ic and IB b) Indicate the directions of 1c and 1B you have labeled in (a) above. Indicate on the diagram, the position where the output V0 would be tapped.
answer
K.C.S.E Physics Q & A - MODEL 2004PP1QN34The work function of a certain material is 3.2 3V. Determine the threshold frequency for the material. (1 electron Volt (eV)= 1.6 x10-19) and planks Constant h=6.62 x 10-34Js)
K.C.S.E Physics Q & A - MODEL 2004PP1QN33
State the difference between hard X-ray and soft X-rays.K.C.S.E Physics Q & A - MODEL 2004PP1QN32
​Figure 17 shows the appearance of an alternating signal on a screen of a cathode ray oscilloscope.
On the same diagram, sketch the appearance of the signal when the frequency is doubled and the voltage halved.
K.C.S.E Physics Q & A - MODEL 2004PP1QN31
A vertical object is placed at the focal point F of a diverging lens as shown in Figure 16.
​Sketch a ray diagram to show the image of the object.
K.C.S.E Physics Q & A - MODEL 2004PP1QN30
​Fig. 15 shows water waves of different wavelengths incidentical apertures A and B.
​Complete the diagram to show the pattern of the waves beyond the aperture in each case
K.C.S.E Physics Q & A - MODEL 2004PP1QN29
​A body mass 0.50kg is attached to the end of a string of length 50cm and whirled in a horizontal circle. If the tension in the string is 81N, determine the velocity of the body
K.C.S.E Physics Q & A - MODEL 2004PP1QN28
State the difference between X-rays and Gamma rays in the way in which they are produced.K.C.S.E Physics Q & A - MODEL 2004PP1QN27
​ A balloon is filled with air to volume of 200ml at a temperature of 293K. Determine the volume when the temperature rises to 353K at the voltmeter, V.
K.C.S.E Physics Q & A - MODEL 2004PP1QN26
​The capacitors in the circuit in fig 14 are identical and initially uncharged.
Switch S1 is closed while switch s2 remains open. After sometime, switch s1 is opened and switch s2 closed. Determine the final reading of the voltmeter, V
K.C.S.E Physics Q & A - MODEL 2004PP1QN25
​ A trolley is moving at a uniform speed along a track. A piece of plasticine is dropped on the trolley and sticks on it.
Explain why the trolley slows down.
answer
K.C.S.E Physics Q & A - MODEL 2004PP1QN24
​Figure 13 shows a coin placed in a large empty container. And observer looking into the container from the position shown is unable to see the coin
​Sketch two rays from a point on the coin to show how the observer is able to see the image of the coin after the container if filled with water.
K.C.S.E Physics Q & A - MODEL 2004PP1QN23
​Figure 12 shows a parabolic surface with a source of light placed at its focal point F
​Draw rays to show reflection from the surface when rays from the source strike the surface at points ABC and D.
K.C.S.E Physics Q & A - MODEL 2004PP1QN21&22
​A certain powder of mass. 0.10kg was heated in a container by an electric heater rated 50 w for sometime. The graph below shows the variation of the temperature of the powder with time. Use this information and the graph to answer question
21 and 22.
i) Determine the quantity of heat by the heater from the time the power starts to melt to the time it has all melted.
ii) Determine the specific latent heat of fusion of powder assuming the container absorbs negligible amount of heat K.C.S.E Physics Q & A - MODEL 2004PP1QN20
​ An electric heater is connected to the mains supply. A fault in the mains reduces the supply potential slightly.
Explain the effect on the rate of heating of the heater.
K.C.S.E Physics Q & A - MODEL 2004PP1QN19
State the difference between mechanical and electromagnetic waves.K.C.S.E Physics Q & A - MODEL 2004PP1QN18
​A body of mass 60kg is pulled at a uniform velocity up smooth inclined surface as shown in Figure 1
​If the distance moves along the incline is 4.0m, determine work done by the force F.
K.C.S.E Physics Q & A - MODEL 2004PP1QN17
​The graph below shows how the velocity varies with time for a body thrown vertically upwards.
​Determine the total distance moved by the body
K.C.S.E Physics Q & A - MODEL 2004PP1QN15&16
​Figure 10 show two circuits in which identical dry cells and identical bulbs are used. Use the information in the figure to answer questions 15 and 16
Explain why the bulb in Figure 10(10) will be brighter than each of the bulbs in Figure 10 (a)
Give the reason why the cells in figure 10(b) can be used for a longer period than the cells in Figure 10 (a) K.C.S.E Physics Q & A - MODEL 2004PP1QN14
​The system in figure 9 is in equilibrium.
Determine the weight if the bar.
K.C.S.E Physics Q & A - MODEL 2004PP1QN12&13
​Figure 8 shows a current-carrying coil in a magnetic field.
Use the information on the figure to answer question 12 and 13.
Mark on figure 8 the direction of the forces acting on the sides of the coil labeled State two ways of increasing the force on the coil. |
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